noun
a person who talks boastfully or arrogantly
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He was known as a big talker in the business world, always making grand promises he couldn't keep.
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Don't listen to him, he's just a big talker who never follows through on anything.
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That guy is all bark and no bite, a total big talker.
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She may seem like a big talker, but deep down she's just trying to cover up her insecurities.